[英]Recycler View Unable to load data in the layout
当我尝试运行应用程序时,我的回收站视图无法生成 output。 它无法加载数据并且代码没有错误。
下面是适配器 class PlayerListAdapter.java
public class PlayerListAdapter extends RecyclerView.Adapter<PlayerListAdapter.FeaturedViewHolder> {
ArrayList<plaerListHelperClass> featuredLocation;
public PlayerListAdapter(ArrayList<plaerListHelperClass> featuredLocation) {
this.featuredLocation = featuredLocation;
}
@NonNull
@Override
public FeaturedViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.playerlist,parent,false);
FeaturedViewHolder featuredViewHolder= new FeaturedViewHolder(view);
return featuredViewHolder;
}
@Override
public void onBindViewHolder(@NonNull FeaturedViewHolder holder, int position) {
plaerListHelperClass plaerListHelperClass = featuredLocation.get(position);
String namep= plaerListHelperClass.getPlayerName();
String mailp= plaerListHelperClass.getPlayerEmail();
holder.name.setText(namep);
holder.mail.setText(mailp);
}
@Override
public int getItemCount() {
return featuredLocation.size();
}
public static class FeaturedViewHolder extends RecyclerView.ViewHolder{
TextView name,mail;
public FeaturedViewHolder(@NonNull View itemView) {
super(itemView);
name=itemView.findViewById(R.id.playerName);
mail=itemView.findViewById(R.id.pmail);
}
}
mainactivity.java 这是我的代码的主要活动
public class MainActivity extends AppCompatActivity {
RecyclerView featuredRecycler;
RecyclerView.Adapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
featuredRecycler=findViewById(R.id.playerListRecyclerView);
featuredRecycler();
}
private void featuredRecycler() {
featuredRecycler.setHasFixedSize(true);
ArrayList<plaerListHelperClass> featuredLocation = new ArrayList<>();
featuredLocation.add(new plaerListHelperClass("Shubham","Shubham@gmail.com"));
featuredLocation.add(new plaerListHelperClass("Shubham","Shubham@gmail.com"));
featuredLocation.add(new plaerListHelperClass("Shubham","Shubham@gmail.com"));
featuredLocation.add(new plaerListHelperClass("Shubham","Shubham@gmail.com"));
adapter=new PlayerListAdapter(featuredLocation);
featuredRecycler.setAdapter(adapter);
}
构建此助手 class 以包含要发送到回收站视图布局的元素
plaerListHelperClass.java
public class plaerListHelperClass {
String playerName;
String playerEmail;
public plaerListHelperClass(String playerName, String playerEmail) {
this.playerName = playerName;
this.playerEmail = playerEmail;
}
public String getPlayerName() {
return playerName;
}
public String getPlayerEmail() {
return playerEmail;
}
}
播放列表.xml
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/white">
<TextView
android:id="@+id/playerName"
android:layout_height="wrap_content"
android:textColor="#897668"
android:layout_weight="1.50"
android:layout_width="match_parent"
android:layout_marginTop="10dp"
android:layout_marginLeft="0dp"/>
<TextView
android:id="@+id/pmail"
android:layout_height="wrap_content"
android:textColor="#897668"
android:layout_below="@+id/name"
android:layout_width="match_parent"
android:layout_weight="1"
android:layout_marginTop="10dp"
android:layout_centerHorizontal="true"/>
</LinearLayout>
activity_main.xml
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity"
android:background="@color/white">
<androidx.recyclerview.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/playerListRecyclerView"
tools:ignore="MissingConstraints" />
</androidx.constraintlayout.widget.ConstraintLayout>
欢迎来到堆栈溢出,
您的实现是正确的,但我猜您忘记为 RecyclerView 添加布局管理器。
所以你可以通过将它添加到 xml 或 java class 中来做到这一点:
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity"
android:background="@color/white">
<!-- for Linear layout...-->
<androidx.recyclerview.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/playerListRecyclerView"
tools:listitem="@layout/playerlist"
tools:itemCount="7"
app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
tools:ignore="MissingConstraints" />
</androidx.constraintlayout.widget.ConstraintLayout>
或者,
您可以将其添加到您的 java class 中
private void featuredRecycler() {
featuredRecycler.setHasFixedSize(true);
ArrayList<plaerListHelperClass> featuredLocation = new ArrayList<>();
featuredLocation.add(new plaerListHelperClass("Shubham","Shubham@gmail.com"));
featuredLocation.add(new plaerListHelperClass("Shubham","Shubham@gmail.com"));
featuredLocation.add(new plaerListHelperClass("Shubham","Shubham@gmail.com"));
featuredLocation.add(new plaerListHelperClass("Shubham","Shubham@gmail.com"));
adapter=new PlayerListAdapter(featuredLocation);
featuredRecycler.setAdapter(adapter);
featuredRecycler.setLayoutManager(new LinearLayoutManager(this@MainActivity))
}
如需更多参考,您可以参考https://www.javatpoint.com/android-recyclerview-list-example
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